By-pass valve for locomotives.



J. G. BLUNT. muss VALVE PoR LocoMoTIvEs.

APPLICATION FILED JUNE 16,1908. 921 ,583, Patented May 11, 1909.

2 SHEETS-SHEET l.

` J. G. BLUNT. BY-PASS VALVE FOR LOGOMOTIVES. APPLIOATION FILED JUNE16,1908. 921 ,583 vPatented May 11, 1909.

2 SHEETS-SHBBT 2.

C FIG. 4.

WITNESSES gw. im

THE Nomzls PETER: cu., wAsHmGroN. n. c4

'i the objectionable results of expansion and o eral type which shall bepositively acting,

passage leading from the boiler, and end ex- 'unrrnn srarnsfrarnnreinen.,

JAMES G. BLUNT, OF SCHENECTADY, NEW YORK, ASSIGNOR TO AMERICANLOCOMOTIVE COMPANY, OF NEW YORK, N. Y., A OORPORAllON OF NEW YORK.

BY-PASS VALVE FOR LOCOMOTIVES.

No. 921,588. Specification of Letters Patent. Patented May 11, 1969.Application led 311118 16, 1908. Serial No, 438,699.

To all whom it may concern: l l l erse in bushings or linings, 1T, lixedin the le it known that l, Jannes G. BLUNT, of l valve chest andprovided with ports 6c, Schenectady, in the county of Schenectady ywhich (,:ommunieate with the cylinder ports, and State of New York, haveinvent-ed a cer- N), and through which, by the movements of tain new anduseful improvement in Bythe distribution valve, each of the cylinderPass Valves for Locomotives, of which imports is alternately put intocommunication provement the following is a specification. with the steamspace, a', of the valve chest, lily invention relates to by pass valvest and with the adjacent exhaust space thereof, used in locomotiveengines for preventing j respectively. The ends` of the cylinder are jclosed by heads, 12g, and those of the valve compression in thecylinders when the engine j chest by heads, 12k, and the constructionthus is drifting i, or running, with a closed far described one which iswell known and throttle, on a descending grade, and its obj extensivelyused.

ject is to provide an appliance of this genln the practice of myinvention, l. connect to the outside ot' the valve chest, 12b, an openended horizont-al actuating clyinder, 1'4"', of small diameter, in whichare iitted two pistons, v173 and bore out the main cylinder castingtrans-.'ersely, adjacent to each of the ports, 7). I), to receive, ineach bore, a sleeve or bushing, 15%, having, on one side, ports 1S",communicating with the adjacent induction and eduction port, I), and, onthe other, ports, 18, communicating with a longitudinal passage, 19,formed in the cylinder casting and extending from one of the bushings,18, to the other. A cylindrical valve, 1S, of the rocking or vibratorytype, is tted in each of the bushings, 18a, said valve having atransverse port, 18d, adapted to register with the ports of theinclosing bushing, and having a stem on its outer end which passesthrough, and is guided in, a cap plate, 18e, covering Athe outer end ofthe bushing. 'The area through the ports of the bushings and valves ismade substantially as large as that through the induction and eductionports, o. A crank arm, lSf, is fixed upon the end stein of each of thevalves, 18, and said crank arms are coupled, by connecting rods, 20, tothe pistons, 17a. of the actuating cylinder, 17. The connecting rods,20, pass through the open ends of the cylinder, and are preferably, asshown, coupled to the pistons by ball joints, 20a.

steam supply pipe, 21, leads from the steam space of the valve chest tothe cylinder, 1T. between the pistons, 17a, thereof, and said pipe isenlarged, adjacent to its end and thereby overcome the objectionableresult of hammering and pounding to which devices olf this characterhave ordinarily heretofore been subject; which shall provide an area ofby pass opening equal to that of the main steam port, withoutappreciably increasing the cylinder clearance; and which will furtherperform the functions of cylinder relief or vacuum valves.

The in'iprovement claimed is hereinafter fully set forth.

ln the accompanying drawings: Figure 1 is a view, partly in elevationand partly in section, illustrating an application of my invention to a.locomotive cylinder and valve chest, Fig. 2, a transverse section, onthe line ,r of Fig. 1; Fig. 3, a similar section, on the line y 1/ ofFig. l; Fig. et, a longitudinal section, on the line s e of Fig. 2, andFig. 5, an enlarged section through t-he steam supply pipe.

My invention is herein exemplified in connection with a locomotiveengine cylinder, 12a, in which is fitted a piston, 40, xed upon a pistonrod, 40h, and which communicates, by induction and eduction ports, bl),adjacent to its ends, with a valve chest, 12", having a central steamspace, a, which is in constant communication with a steam supply hanstspaces, 14:, which are in constant communication with an exhaustpassage. The supply and exhaust of steam to and from the cylinder areeffected byv a distribution valve, which is of the internal admissionpiston which communicates with the valve chest, to type, and comprises ahollow or tubular form a chamber for a peripherally grooved body, 16,and two end pistons, 16C, fixed upon i regulating valve, 21a, which,when the locoa valve stem, 1Gb, and reeiprocated by any motive isruiming under steam, seats at- 'the suitable valve gear, in the ordinarymanner. lower end of chamber, and restricts the pas- The end pistons,16, are fitted truly to travsage of steam to the cylinder to that perbyatmospheric pressure and in the other by boiler' pressure and positivelyconnected to said falve.

ln a by pass mechanism for locomotive cylinders, the combination ot' apassage directly connecting the induction and eduction ports ot` the.main cylinder, valves controlling; communication between said passageand said ports, actuating mechanism operated in one direction byatmospheric pressure and in the other by boiler pressure and positivelyconnected to said valves, and a valve t'or automatically regulating' theapmitted by its `grooves. Vhen the locomotive is not under steam, theregulating,` valve falls by gravity into position in which it does notIrestrict the arca ot the supply pipe, l as shown in Fig. o. l In theoperation ol" the appliance, when l the throttle ot' the locomotive isopened, I steam is admitted from the valve chest, between the pistons,i7, ot the actuating' cylinder, the supply being siiitably regulated bythe valve, 2l, and said pistons, being` thereby forced outwardly in thecylinder, turn the valves, i8, through the connecting` rods, 3C', intoposition in which their ports, plication ot' pressure to saidactuatingmechlf'l, are moved ont ot register with the ports anism. otthe bnshings. lo, and communication be-` ln a by pass mechanism forlocomotives tween one end ot the eng-'ine cylinder, 12a, having' a valvechest and main cylinder, the and the other, is thereby cut oli?. v'lienthe combination ol" a passage directly connectthrottle closed, and theengine is running' ine' the induction and eduction ports ot the withoutsteam in the cylinders, atn'iospheric main cylinder, valves adapted toopen or pressure on the open outer sides ot the pisclose Adirectcommunication between said tons, acting' against the vacuum` or partialpassage and said ports, an open ended actuvacuum, Vwhich is formed inthe valve chest ating' cylinder loci ted between said valves, by themovements ot the main pistons, pistons litting' said cylinder andcoupled to 'liorcos the pistons of the actuatinfg` cylinder, saidvalves, and a steam supply pipe conl. inwardly, and thereby moves thevalves, necting the space between the pistons oit the lo. into thepositions shown in 4l, in actuating cylinder with the steam space of thedistribution valve chest.

G. ln a by pass mechanism for locomotive which positions treecommunication is established between the ends ot the engine cylinders,12-, through the induction and cylinders.v the combination of a passagedicduction ports, the ports ot the valves, i'ectly connecting' theinduction and ednction lt?, and their bushings, and the intermediatepassage, 19.

claim as my invention and desire to secure by Letters Patent:

l. In a by pass mechanism tor locomotive cylinders, the combination ot'a passage directly connecting' the induction and eduction ports ot' themain cylinder, valves adapted to open and close direct communicationbetween said passage and said ports, and tluid pressure actuating'mechanism positively connected to said valves and in connnunic: tionwith a source of pressure.A

ln a by pass mechanism tor locomotives ha ving' a valve chestr and maincylinder, the combination of a passage formed in the main cylindercasting,y and directly connecting' the induction and eduction portsthereof, valves adapted to open and close direct communication betweensaid passage and said ports, and a tluid pressure cylinder incommunication with the valve chest and havingl a piston connected to andelilectinel the opening' and closure ot.' said alves 3. ln a bypassmechanism for locomotive cylinders, the combination of a` passagedirectly connect-ing' the induction and eduction ports ot the maincylinder. valves adapted to open or close direct communication betweensaid passage and said ports, and actuating mechanism operated in onedirection ports ot the main cylinder, valves controlling communicationbetween said passage and said ports, an open ended actuating' cylinderlocated between said valves, pistons titting said cylinder and coupledto said valves, a steam supply pipe connecting' the space between thepistons of the actuating' cylinder' with the steam space or" thedistribution valve chest, and an automatic regulating valvecanitrollinlc` said steam supply pipe.

ln a by pass mechanism tor locomotives having a valve chest and maincylinder, the combination ot' a passage formed in. the main cylindercasting' and directly connectine' the induction and eduction portsthereof, r cking' or vibratory valves adapted to open or close directconuminication between said passage and said ports', crank arms liXed onthe ends ot said valves, an open ended actuating cylinder locatedbetween said valves, pistons littingl said cylinder, connectionscoupling' said pistons to the crank arms ot the valves', and a steamsupply pipe connecting' the space between said pistons with the steamspace ot the distribution valve chest.

JAMES G. LUN lritnesses:

Hai.. S'rarroin), J. S. Prmrrnn.

